Not every error can be handled..!

Did you know that there are a whole bunch of errors that cannot be trappedby a TSQL ‘TRY – CATCH ‘ block?

Behold ..!

Microsoft Docs says…

Errors Unaffected by a TRY…CATCH Construct

TRY…CATCH constructs do not trap the following conditions:+

  • Warnings or informational messages that have a severity of 10 or lower.
  • Errors that have a severity of 20 or higher that stop the SQL Server Database Engine task processing for the session. If an error occurs that has severity of 20 or higher and the database connection is not disrupted, TRY…CATCH will handle the error.
  • Attentions, such as client-interrupt requests or broken client connections.
  • When the session is ended by a system administrator by using the KILL statement.The following types of errors are not handled by a CATCH block when they occur at the same level of execution as the TRY…CATCH construct:
  • Compile errors, such as syntax errors, that prevent a batch from running.
  • Errors that occur during statement-level recompilation, such as object name resolution errors that occur after compilation because of deferred name resolution.These errors are returned to the level that ran the batch, stored procedure, or trigger.

    If an error occurs during compilation or statement-level recompilation at a lower execution level (for example, when executing sp_executesql or a user-defined stored procedure) inside the TRY block, the error occurs at a lower level than the TRY…CATCH construct and will be handled by the associated CATCH block.

     

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